For me personally the usability versus the technical implementation is not worth. It would be good probably for the topics in whole, but for separate posts?.. What sense does it make?

It also reminds me the "karma" add-on, where you could vote for the post, but increasing / decreasing the amount of user's "virtual karma". There should be a lot of limits, for example, you can't give more karma as you have, and only for a limited number of people per 24 hours.

I think I would have to have a dedicated server to have it too ;). It may depend on the community - if it's mature enough, it would be useful. Most of them aren't mature enough though ;) so I agree with Paul. I think the implementation of the idea is nicely done.

It's about rating good answers. It's a musicians forum and usually the answers aren't exact like in a forum abount computers, development, internet, etc. Also we have a lot of chat. With posts rating the readers can just surf between the good ones.

It's not about rating users (at this time).For sure I understand it :-) I only described the similar algorithm which I implemented in the past.

I agree if your forums is more like a chat it would be useful. Specially if they have a lot of users and this rating could be more than true else false ;-) That was actually the digg.com's idea - a LOT of users. Where users are just few, such rating rather won't work.